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| author | Becky Bruce <beckyb@kernel.crashing.org> | 2011-07-18 18:49:16 -0500 |
|---|---|---|
| committer | Kumar Gala <galak@kernel.crashing.org> | 2011-07-22 03:07:47 -0500 |
| commit | 51f924e5ce4f69659ef385739f4604054d9b5bb7 (patch) | |
| tree | feb642da76d6cb6726eede03341ab51e9ff69f3a | |
| parent | 9cdfe2810693135773602e7c98b78a4af2873a61 (diff) | |
| download | u-boot-imx-51f924e5ce4f69659ef385739f4604054d9b5bb7.zip u-boot-imx-51f924e5ce4f69659ef385739f4604054d9b5bb7.tar.gz u-boot-imx-51f924e5ce4f69659ef385739f4604054d9b5bb7.tar.bz2 | |
board/tqm85xx: Create and tear down TLB for get_ram_size()
We need a TLB entry to call get_ram_size(); the common code doesn't create
one until *after* fixed_sdram() has determined the size. So we set up tlbs
for the max possible size and tear them down once we're done with
get_ram_size(); the common 85xx code will then set up a final set of tlb
entries for the *actual* detected size of ddr.
This prevents us from having TLB entries that are larger than DDR sitting
around for very long, which is not a recommended scenario.
Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
| -rw-r--r-- | board/tqc/tqm85xx/sdram.c | 7 | ||||
| -rw-r--r-- | include/configs/TQM85xx.h | 6 |
2 files changed, 13 insertions, 0 deletions
diff --git a/board/tqc/tqm85xx/sdram.c b/board/tqc/tqm85xx/sdram.c index 39a9e21..baf073e 100644 --- a/board/tqc/tqm85xx/sdram.c +++ b/board/tqc/tqm85xx/sdram.c @@ -363,6 +363,12 @@ static phys_size_t sdram_setup(int casl) udelay (1000); #endif /* CONFIG_TQM8548 */ + /* + * get_ram_size() depends on having tlbs for the DDR, but they are + * not yet setup because we don't know the size. Set up a temp + * mapping and delete it when done. + */ + setup_ddr_tlbs(CONFIG_SYS_DDR_EARLY_SIZE_MB); for (i = 0; i < N_DDR_CS_CONF; i++) { ddr->cs0_config = ddr_cs_conf[i].reg; @@ -376,6 +382,7 @@ static phys_size_t sdram_setup(int casl) break; } } + clear_ddr_tlbs(CONFIG_SYS_DDR_EARLY_SIZE_MB); #ifdef CONFIG_TQM8548 if (i < N_DDR_CS_CONF) { diff --git a/include/configs/TQM85xx.h b/include/configs/TQM85xx.h index 79a958d..b336723 100644 --- a/include/configs/TQM85xx.h +++ b/include/configs/TQM85xx.h @@ -147,10 +147,16 @@ * DDR Setup */ #define CONFIG_SYS_DDR_SDRAM_BASE 0x00000000 /* DDR is system memory */ + #if defined(CONFIG_TQM_BIGFLASH) || \ (!defined(CONFIG_TQM8548_AG) && !defined(CONFIG_TQM8548_BE)) #define CONFIG_SYS_PPC_DDR_WIMGE (MAS2_I | MAS2_G) +#define CONFIG_SYS_DDR_EARLY_SIZE_MB (512) +#else +#define CONFIG_SYS_PPC_DDR_WIMGE (0) +#define CONFIG_SYS_DDR_EARLY_SIZE_MB (2 * 1024) #endif + #define CONFIG_SYS_SDRAM_BASE CONFIG_SYS_DDR_SDRAM_BASE #ifdef CONFIG_TQM8548_AG #define CONFIG_VERY_BIG_RAM |